Since you upgrade so infrequently X570
It will be fine. 
That’s what the genre blind would be protagonist says before he walks off alone into the darkness only to be immediately eaten by some evil thing not fully revealed until the end of the story.
Joking aside here’s hoping board makers help keep AMD’s promise of compatibility for AM4. But they gotta be wanting to get a ROI on the board development for X570. Fingers crossed
Im not even sure its ROI more can the low end X3’s and X4’s be certified to run all of the 3K AM4 product stack. Its pretty safe to say no… so AMD has to tread a line here.